[wruza]

And then you have to implement business directives with “the same date in 2025” in documents already signed by all parties (and no one got confused, except math guys). Replace is not a mistake, it just should state what it does, so that a programmer could test and use it.

[ehsankia]

It does state what it does, but people rarely read documentations, and unlike static languages, Python doesn't force you to deal with the exception. And since it's a very rare problem, most people don't catch the bug.